Title:
ELECTRIC POWER CONVERSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/053581
Kind Code:
A1
Abstract:
This electric power conversion device comprises a plurality of electric power conversion units (20), electric current sensors (301) for detecting an electric current of output terminals of the electric power conversion units, and a control unit (310) for measuring a frequency component in a predetermined frequency range of the electric current detected by the electric current sensors. Each electric power conversion unit has an AC/DC converter (113) for outputting an AC electric power from an input terminal to the output terminal, a smoothing capacitor (18) connected in parallel to the output terminals for smoothing an output voltage, and a variable resistance switch (201) connected between one end of the smoothing capacitor and one end of the output terminal. The control unit controls resistance values of the variable resistance switches according to the magnitude of the predetermined frequency component detected by the electric current sensors, and the output terminals of the plurality of electric power conversion units are connected in parallel and constitute output terminals (37, 38) as the electric power conversion device (1).
Inventors:
KAMIZUMA HIROSHI (JP)
KANOUDA AKIHIKO (JP)
MABUCHI YUUICHI (JP)
FURUKAWA KIMIHISA (JP)
KANOUDA AKIHIKO (JP)
MABUCHI YUUICHI (JP)
FURUKAWA KIMIHISA (JP)
Application Number:
PCT/JP2022/022709
Publication Date:
April 06, 2023
Filing Date:
June 06, 2022
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02M7/12
Foreign References:
| JP2006311740A | 2006-11-09 | |||
| JP2019009923A | 2019-01-17 | |||
| JP2019054581A | 2019-04-04 | |||
| JP2004112894A | 2004-04-08 | |||
| JP2004104957A | 2004-04-02 |
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)
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